QPR extended their lead at the top of the Championship table thanks to a fine second-half display and a helping hand from Coventry keeper Keiren Westwood.
The Sky Blues were in control before the break with Clive Platt and Richard Wood having powerful headers superbly saved by visiting keeper Paddy Kenny.
But Westwood diverted Kyle Walker's cross into his own net soon after the break to gift QPR the opener.
And Tommy Smith's header sealed the win from Adel Taarabt's classy cross.
Smith's clever flicked effort effectively ended the match with 30 minutes still remaining as the west Londoners - who have the best defensive record in the division - never looked in danger of surrendering that lead.
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